材料科学
摩尔吸收率
地平面
光电子学
光学
极化(电化学)
聚二甲基硅氧烷
液态金属
吸收(声学)
微流控
印刷电路板
复合材料
纳米技术
电信
化学
物理
操作系统
物理化学
计算机科学
天线(收音机)
作者
Do Young Lim,Sungjoon Lim
出处
期刊:IEEE Access
[Institute of Electrical and Electronics Engineers]
日期:2018-01-01
卷期号:6: 40854-40859
被引量:15
标识
DOI:10.1109/access.2018.2857472
摘要
This paper proposes a switchable metasurface for broadband and polarization-insensitive absorption, whose absorption spectrum can be fluidically switched using liquid metal. The proposed metasurface consists of a top metallic pattern, a flexible printed circuit board substrate, a polydimethylsiloxane substrate, and a bottom metallic ground plane. The proposed unitcell is inspired by a four-circular-sector structure. To maintain the symmetrical geometry and increase the switching range, a symmetrical microfluidic channel is designed with a circular ring capillary and four isolated patches. To measure the absorptivity of the proposed metasurface, 10 × 10 unitcells are fabricated with 20 inlets and 20 outlets. When the microfluidic channels of the metasurface are empty, the fabricated metasurface achieves an absorptivity of higher than 90%, from 6.23 to 12.14 GHz. When eutectic gallium-indium alloy is injected into the microfluidic channels, the fabricated metasurface achieves higher than 90% absorptivity, from 5.44 to 6.12 GHz. Thus, for both cases, the absorptivity is constant at different incident polarization angles.
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